CONTENTS 



PART I. MARINE SEDIMENT PROPERTIES 



Introduction . . . page 7 



Programs in Geology and Geophysics ... 9 



Sound velocity and related properties of marine sediments 

 (laboratory measurements) ... 9 



Introduction ... 9 



Measurements to July 1975 ... 9 



Regression equations interrelating various sediment properties . . .10 



Recent and current measurements of sediment physical properties ... 1 2 



Compressional-wave velocity profiles and gradients in the sea floor ... 1 3 



Introduction ... 13 



Studies from 1974 to 1977 ... 13 



Current studies ... 14 



Attenuation of compressional (sound) waves in marine sediments and rocks ... 14 



Introduction ... 14 



Studies from 1974 to 1977 . . . 1 5 



Variations of density and porosity with depth in deep-sea sediments ... 16 



Introduction ... 1 6 



Studies from 1 974 to 1 977 ... 1 6 



Shear wave velocity profiles in marine sediments ... 17 



Introduction ... 17 



Studies from 1974 to 1977 ... 18 



Attenuation of shear waves in marine sediments ... 18 



Introduction ... 1 8 



Studies from 1974 to 1977 ... 19 



Sound velocity-density relations in sea-floor sediments and rocks ... 19 



Introduction ... 19 



Studies from 1974 to 1977 .. . 19 



Production of geoacoustic models ... 20 



Introduction ... 20 



Studies from 1974 to 1977 . . . 20 



Summary ... 21 

 References ... 22 



PART II: ACOUSTIC MODELING 



Introduction . . . page 45 



Formulation of the sound field using the plane wave reflection coefficient R ... 45 



Ray theory ... 46 

 Wave theory ... 46 



